﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace Yuki.Sockets.Encryptions
{
    public class ConquerKeys
    {
        #region public static byte[] Key1 = new byte[256];
        public static byte[] Key1 = 
            {
			    0x9D, 0x90, 0x83, 0x8A, 0xD1, 0x8C, 0xE7, 0xF6, 0x25, 0x28, 0xEB, 0x82, 0x99, 0x64, 0x8F, 0x2E,
			    0x2D, 0x40, 0xD3, 0xFA, 0xE1, 0xBC, 0xB7, 0xE6, 0xB5, 0xD8, 0x3B, 0xF2, 0xA9, 0x94, 0x5F, 0x1E, 
		    	0xBD, 0xF0, 0x23, 0x6A, 0xF1, 0xEC, 0x87, 0xD6, 0x45, 0x88, 0x8B, 0x62, 0xB9, 0xC4, 0x2F, 0x0E, 
		        0x4D, 0xA0, 0x73, 0xDA, 0x01, 0x1C, 0x57, 0xC6, 0xD5, 0x38, 0xDB, 0xD2, 0xC9, 0xF4, 0xFF, 0xFE, 
		    	0xDD, 0x50, 0xC3, 0x4A, 0x11, 0x4C, 0x27, 0xB6, 0x65, 0xE8, 0x2B, 0x42, 0xD9, 0x24, 0xCF, 0xEE, 
		    	0x6D, 0x00, 0x13, 0xBA, 0x21, 0x7C, 0xF7, 0xA6, 0xF5, 0x98, 0x7B, 0xB2, 0xE9, 0x54, 0x9F, 0xDE, 
		    	0xFD, 0xB0, 0x63, 0x2A, 0x31, 0xAC, 0xC7, 0x96, 0x85, 0x48, 0xCB, 0x22, 0xF9, 0x84, 0x6F, 0xCE, 
		        0x8D, 0x60, 0xB3, 0x9A, 0x41, 0xDC, 0x97, 0x86, 0x15, 0xF8, 0x1B, 0x92, 0x09, 0xB4, 0x3F, 0xBE, 
		        0x1D, 0x10, 0x03, 0x0A, 0x51, 0x0C, 0x67, 0x76, 0xA5, 0xA8, 0x6B, 0x02, 0x19, 0xE4, 0x0F, 0xAE, 
		    	0xAD, 0xC0, 0x53, 0x7A, 0x61, 0x3C, 0x37, 0x66, 0x35, 0x58, 0xBB, 0x72, 0x29, 0x14, 0xDF, 0x9E, 
			    0x3D, 0x70, 0xA3, 0xEA, 0x71, 0x6C, 0x07, 0x56, 0xC5, 0x08, 0x0B, 0xE2, 0x39, 0x44, 0xAF, 0x8E, 
			    0xCD, 0x20, 0xF3, 0x5A, 0x81, 0x9C, 0xD7, 0x46, 0x55, 0xB8, 0x5B, 0x52, 0x49, 0x74, 0x7F, 0x7E, 
		        0x5D, 0xD0, 0x43, 0xCA, 0x91, 0xCC, 0xA7, 0x36, 0xE5, 0x68, 0xAB, 0xC2, 0x59, 0xA4, 0x4F, 0x6E, 
			    0xED, 0x80, 0x93, 0x3A, 0xA1, 0xFC, 0x77, 0x26, 0x75, 0x18, 0xFB, 0x32, 0x69, 0xD4, 0x1F, 0x5E, 
			    0x7D, 0x30, 0xE3, 0xAA, 0xB1, 0x2C, 0x47, 0x16, 0x05, 0xC8, 0x4B, 0xA2, 0x79, 0x04, 0xEF, 0x4E, 
			    0x0D, 0xE0, 0x33, 0x1A, 0xC1, 0x5C, 0x17, 0x06, 0x95, 0x78, 0x9B, 0x12, 0x89, 0x34, 0xBF, 0x3E
            };
        #endregion
        #region public static byte[] Key2 = new byte[256];
        public static byte[] Key2 =
            {
				0x62, 0x4F, 0xE8, 0x15, 0xDE, 0xEB, 0x04, 0x91, 0x1A, 0xC7, 0xE0, 0x4D, 0x16, 0xE3, 0x7C, 0x49,
				0xD2, 0x3F, 0xD8, 0x85, 0x4E, 0xDB, 0xF4, 0x01, 0x8A, 0xB7, 0xD0, 0xBD, 0x86, 0xD3, 0x6C, 0xB9,
				0x42, 0x2F, 0xC8, 0xF5, 0xBE, 0xCB, 0xE4, 0x71, 0xFA, 0xA7, 0xC0, 0x2D, 0xF6, 0xC3, 0x5C, 0x29,
				0xB2, 0x1F, 0xB8, 0x65, 0x2E, 0xBB, 0xD4, 0xE1, 0x6A, 0x97, 0xB0, 0x9D, 0x66, 0xB3, 0x4C, 0x99,
				0x22, 0x0F, 0xA8, 0xD5, 0x9E, 0xAB, 0xC4, 0x51, 0xDA, 0x87, 0xA0, 0x0D, 0xD6, 0xA3, 0x3C, 0x09,
				0x92, 0xFF, 0x98, 0x45, 0x0E, 0x9B, 0xB4, 0xC1, 0x4A, 0x77, 0x90, 0x7D, 0x46, 0x93, 0x2C, 0x79,
				0x02, 0xEF, 0x88, 0xB5, 0x7E, 0x8B, 0xA4, 0x31, 0xBA, 0x67, 0x80, 0xED, 0xB6, 0x83, 0x1C, 0xE9,
				0x72, 0xDF, 0x78, 0x25, 0xEE, 0x7B, 0x94, 0xA1, 0x2A, 0x57, 0x70, 0x5D, 0x26, 0x73, 0x0C, 0x59,
				0xE2, 0xCF, 0x68, 0x95, 0x5E, 0x6B, 0x84, 0x11, 0x9A, 0x47, 0x60, 0xCD, 0x96, 0x63, 0xFC, 0xC9,
				0x52, 0xBF, 0x58, 0x05, 0xCE, 0x5B, 0x74, 0x81, 0x0A, 0x37, 0x50, 0x3D, 0x06, 0x53, 0xEC, 0x39,
				0xC2, 0xAF, 0x48, 0x75, 0x3E, 0x4B, 0x64, 0xF1, 0x7A, 0x27, 0x40, 0xAD, 0x76, 0x43, 0xDC, 0xA9,
				0x32, 0x9F, 0x38, 0xE5, 0xAE, 0x3B, 0x54, 0x61, 0xEA, 0x17, 0x30, 0x1D, 0xE6, 0x33, 0xCC, 0x19,
				0xA2, 0x8F, 0x28, 0x55, 0x1E, 0x2B, 0x44, 0xD1, 0x5A, 0x07, 0x20, 0x8D, 0x56, 0x23, 0xBC, 0x89,
				0x12, 0x7F, 0x18, 0xC5, 0x8E, 0x1B, 0x34, 0x41, 0xCA, 0xF7, 0x10, 0xFD, 0xC6, 0x13, 0xAC, 0xF9,
				0x82, 0x6F, 0x08, 0x35, 0xFE, 0x0B, 0x24, 0xB1, 0x3A, 0xE7, 0x00, 0x6D, 0x36, 0x03, 0x9C, 0x69,
				0xF2, 0x5F, 0xF8, 0xA5, 0x6E, 0xFB, 0x14, 0x21, 0xAA, 0xD7, 0xF0, 0xDD, 0xA6, 0xF3, 0x8C, 0xD9
            };
        #endregion
    }
    #region Packet & Buffer
    public class PacketDLL
    {
        public unsafe class Native
        {
            [DllImport("msvcrt.dll")]
            public static extern unsafe void* memcpy(void* dest, void* src, uint size);
        }
        public byte[] Buffer;
        public int BufferLength;

        public unsafe byte[] Packet
        {
            get
            {
                byte[] ret = new byte[BufferLength];
                fixed (byte* src = Buffer, des = ret)
                    Native.memcpy(des, src, (uint)BufferLength);
                return ret;
            }
        }
    }
    #endregion
    public unsafe class ConquerStanderedCipher : IPacketCipher
    {
        #region Private Variables
        private byte[] Key3;
        private byte[] Key4;
        private ushort InCounter = 0;
        private ushort OutCounter = 0;
        private bool UsingAlternate = false;
        #endregion
        public void Encrypt(byte* In, byte[] Out, int Length)
        {
            lock (this)
            {
                for (int i = 0; i < Length; i++)
                {
                    Out[i] = (byte)(In[i] ^ 0xAB);
                    Out[i] = (byte)((Out[i] << 4) | (Out[i] >> 4));
                    Out[i] = (byte)(ConquerKeys.Key2[OutCounter >> 8] ^ Out[i]);
                    Out[i] = (byte)(ConquerKeys.Key1[OutCounter & 0xFF] ^ Out[i]);
                    OutCounter = (ushort)(OutCounter + 1);
                }
            }
        }
        public void Encrypt(byte[] In, byte[] Out, int Length)
        {
            lock (this)
            {
                for (int i = 0; i < Length; i++)
                {
                    Out[i] = (byte)(In[i] ^ 0xAB);
                    Out[i] = (byte)((Out[i] << 4) | (Out[i] >> 4));
                    Out[i] = (byte)(ConquerKeys.Key2[OutCounter >> 8] ^ Out[i]);
                    Out[i] = (byte)(ConquerKeys.Key1[OutCounter & 0xFF] ^ Out[i]);
                    OutCounter = (ushort)(OutCounter + 1);
                }
            }
        }
        public void Decrypt(byte[] In, byte[] Out, int Length)
        {
            lock (this)
            {
                for (int i = 0; i < Length; i++)
                {
                    Out[i] = (byte)(In[i] ^ 0xAB);
                    Out[i] = (byte)((Out[i] << 4) | (Out[i] >> 4));
                    if (UsingAlternate)
                    {
                        Out[i] = (byte)(Key4[InCounter >> 8] ^ Out[i]);
                        Out[i] = (byte)(Key3[InCounter & 0xFF] ^ Out[i]);
                    }
                    else
                    {
                        Out[i] = (byte)(ConquerKeys.Key2[InCounter >> 8] ^ Out[i]);
                        Out[i] = (byte)(ConquerKeys.Key1[InCounter & 0xFF] ^ Out[i]);
                    }
                    InCounter = (ushort)(InCounter + 1);
                }
            }
        }
        public unsafe void SetKeys(uint inKey1, uint inKey2)
        {
            uint dwKey1 = ((inKey1 + inKey2) ^ 0x4321) ^ inKey1;
            uint dwKey2 = (uint)(dwKey1 * dwKey1);
            Key3 = new byte[256];
            Key4 = new byte[256];
            fixed (void* uKey1 = ConquerKeys.Key1, uKey3 = Key3,
                         uKey2 = ConquerKeys.Key2, uKey4 = Key4)
            {
                const byte dwKeyLoop = 256 / 4;
                for (byte i = 0; i < dwKeyLoop; i++)
                {
                    *(((uint*)uKey3) + i) = dwKey1 ^ *(((uint*)uKey1) + i);
                    *(((uint*)uKey4) + i) = dwKey2 ^ *(((uint*)uKey2) + i);
                }
            }
            OutCounter = 0;
            UsingAlternate = true;
        }
    }
}
